Flexible conduit.



No. 880,850. v PATENTED MAR. 3, 1908. (T. S. WILSON.

FLEXIBLE OONDUIT.

APPLICATION FILED MAY 20. 1907.

I lllllllllil I III JAMES S. WILSONQOF CHELSEA, MASSACHUSETTS.

FLEXIBLE oonnurr.

To all whom it may concern:

Be it known that LJAMES S. WILSON, of Chelsea, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Flexible Conduits, of which the following is a specification.

This invention'relates to an im rovement in flexible conduits, and particu arly, that class shown in the patent to Herrick, No. 456,271, dated July 21, 1891, and consists in securing the fiber convolutes forming the. lining at different points, to the body of the tube to prevent the fiber being pulled out.

Figure 1 is a detail view, showing a section of a conduit constructed in accordance with my invention, a part of the conduit being broken away, in order to show the means for securing the spiral fiber to the body of the tube. Eig. 2 is' a view similar to Fig. 1, showing a somewhat. different arrangement of the fastening members; Fig. 3 is a cross-sectional view, on line 3 -3 of Fig. 2, showing the arrangement of the fastening member with the convolutes of'the spiral and the body of the tube. Fig. 4 is a detail view ofapiece of the spirally wound .fiber strip withthe fastening member arranged therein, the edges of the strips being separated. Fig. 5 shows a way of passing the fastening devices through the convolutes of the fiber strip, the bending of the tube in the form shown forcing the fiber strip against the wall of the tube, so that a straight needl 6r tool will penetrate the fiber.

T e same, reference characters indicate e same parts in all ofthe figures.

The specific form of tube shown in the drawings is that shown in the patent to Herrick, No. 456,271, dated July 21, 1891. I do not wish, however, to be understood as limiting my invention to that specific form of tube, my invention being applicable to all forms of'tubing employing a core or lining made up of spirally wound strips of fiber, or other material. I. take the Herrick form of tube merely as an illustration. In the use of the Herrick form of tube and all flexible conduits whose inner walls are made up of a strip of fiber wound spirally, no means other than the cementing of the Y Specification of Letters Iatent. Application filed Mav 20.1907. Serial No- 374.604.

atent d. as, 190s.

spiral to the walls of the tube have been de- VISGd to prevent the pulling out of the fiber strip, either accidentally or purposely. This has proved a great defect and many expedients have been attempted to overcome this defect, but .without success.

In thedrawings, the tube is shown as composed of a strip 1, of fiber, wound spirally on itself. Upon this strip called a friction tape 2, which serves to hold the convolutes of spiral. fiber 1, together in the form of a tube. Upon the tape 2 is applied a covermg 3, in any suitable way, the

covering 8, here shown, consisting of threads.

of cotton interwoven.

4 represents a thread or other fastener of non-conducting material passed through the Wall of the tube and under and around cer tain convolutes of the fiber strip 1, as in Fig. 1, or continuously back and forth along one side of the tube through the body of the tube and between or through the convolutes the stri 1, as in Figs. 2 and 3, or. throught'he bodyo the tube and one or more of the convolutes of the strip 1, as in Figs. 4 and 5. The fastening member 4 may be of'thread,or any other preferred means. I have not attempted to show all of the ways in which this fastening member may be applied. A tube constructed as described,-wherein the convolutes of the tape 2 are secured to the body of the tube at different points, prevents the withdrawal of the strip 1 from the tube.

While in the drawings I have shown the fastening member passing entirely through is applied what is the body of the tube, yet, manifestly, my invention embraces like constructions where the fastening member connects the 'convolutes of the tape to the wall of the bodyof the tube in any way. The fastening member may be passed through the body of the tube and the strip 1, by any suitable tool, operated by hand or by, any suitable machine.

In Figs. 4 and 5, the symbol 4 indicates not only the thread, but also the path taken by the tool by which the thread is inserted.

Having thus explained the nature of my invention and described a way of constructing and using the same, though without at- -tempting to setlfort h all of the forms in} hers securing said tube at different points to 10 which it may be made, or all of the modes of said body.

its use, what I claim and desire to secure by In testimony whereof I have aflixed my Letters Patient is signature, in'pres'ence of two Witnesses.

A flexib e con uit comprising an inner Y wall composed of successive turns of a strip JAMES W of materlal, forming a tube, a body of any Witnesses:

suitable material, applied to and surrounding H. L. ROBBINS,

said tube, and a fastening member or mem- E. BATOHELDER. 

